Box-making machine



May 15, 1928. 1,669,793

A. UHLIG BOX MAKING MACHINE Fiied 11. 1927 5 sheets-sheet 1 May 15, 1928. 1,669,793

A. UHLIG BOX MAKING MACHINE Filed March 11. 1927 5 Sheets-Sheet 2 May 15, 1928.

A. UHLiG BOX MAKING MACHINE Filed March 11, 1927 5 Sheets-Sheet 4 Fig.

me/v r0 Ii WW Bf W W May 15. 1928. 1,669,793

, A. UHLIG BOX MAKING MACHINE Filed'March 11, 1927 5 Sheets-Sheet 5 Fig.

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,9, M l/I6 INVQNTOR Patented May 15, 1928.

UNITED STATES PATENT- OFFICE.

ALBERT UHLIG, OIF DRESDEN-A, GERMANY, ASSIGNOR 10 THE FIRM MASCHINEN- FABRIK LAUBE, KURT U. RUDOLF LAUBE, F DBESDEN, GERMANY. I

BOX-MAKING MACHINE.

Application flied March 11, 1927, Serial No. 174,631, and in Austria January 26, 1927.

This invention relates to a machine for the manufacture of box parts, more particularly box lids. In such machines it is usual to place the blank upon a rectangular lower 5 stamp and to bend or draw the side flaps of the blank into the desired position by the aid of an upper stamp provided with a corresponding recess.

The invention is based upon effecting the W mechanical introduction of the blank, in such a way that the feeding of a fresh blank is only possible when the previous blank has been removed from the stamping apparatus, while in the event of the finished blank remaining sticking in the stamping apparatus, the feeding device is locked. Moreover the fresh blank is accurately positioned in the stamping apparatus. The corners cut out from the blank by the stamping process are removed, and the finished blank that has been cut and bent is pulled away from the lower stamp, so that it can easily be ejected.

For this purpose there are provided on the upper stamp hook-shaped strippers, the

hooked ends of which slide under the feeding plane of th blanks on the side walls of the stamp. Furthermore there are provided on the upper stamp two straightening sur faces which form a right angle and which,

when the stamp is raised, extend within the range of the feeding plane of the blank. Opposite to these straightening surfaces there are guides with oblique surfaces, which bring the blank that has been pushed on .to

36 the lower stamp to bear accurately against the straightening surfaces. Furthermore there are provided at the four corners of the upper stamp, right-angled separating knives, which in co-o-peration with the upper rims 40 of four passages of rectangular cross section provided at the corners of the lower stamp, separate from the piece of work, the cutout corners, which, after separation, drop into the said passages. For the finished articles pulled off the lower stamp by the strippers during the ascent of the upper stamp after the stamping and drawing work has been efl'ected, an ejector is provided, which delivers the finished articles against a movable stop, by the movement of which a locking device or the like, for locking the feeding device for the fresh blank to be introduced, is-rele'ased.

In the constructional example of the new 65 machine illustrated in the accompanying drawings, the blanks are taken from a pile provided on a table arrangedat the level of the lower stamp by a pusher, which from time to time delivers the lowest sheet in the pile to the stamping and drawing press.

The new machine is illustrated in Figures 1 and 2 of the accompanying drawings in plan and in side elevation respectively;

Figures 1 and 1 illustrate respectively an article manufactured by the machine and a rectangular blank used for the production of the article.

Figs. 3 to 5 show the upper and lower stamps of the stamping and drawing presses in three different positions;

Fig. 6 is a view of the lower stamp from above.

The object of the machine is to produce an article of the kind illustrated in Fig. 1" of the drawings. This piece of work is made from a rectangular blank of the form illustrated in Fig. 1 In the stamping apparatus, from a blank according to Fi 1 thefour corners are cut out from the Iilank, as indicated in dotted lines, and then the marginal flaps a, b, 0 and (1 produced by cutting the corners are bent over along the dot and dash lines in this figure.

The blanks 1 are stacked in a suitable receptacle 2, which is arranged on the table 3 of the machine frame A. The table 3 has guides 4 in which a pusher 5 can slide, which delivers the articles to the stamping apparatus and which is driven in a known manner by a crank or the like by means of the rod gear 7, 8 and 9.

In order that only the bottom blank may be carried along from time to time by the pusher, small knives 10 are fitted to the pusher 5, and these project the thickness of one blank above the table 3. During the forward stroke of the pusher 5, the knives 10 penetrate into the pile of blanks, se arate the lowest blank from the pile, and eliver it through a gap 11, which is provided in 100 the wall 12 of the receptacle containing the pile of blanks, facing the stamping apparatus. The gap 11 is mounted on one side by the table plate 3 and on the other side by the under surface 13 of a slide 14, which can .05

slide in guides 15 on the wall 12. By means of a screw 16 and a nut 17, the slide' l l can be so adjusted that the'breadth of the gap '11 corresponds exactly to the thickness of one blank. Hence only one blank can be r the corners of the blan fected either by the cut-out portions as isted removed from the receptacle 2 at a time. The blanks are guided at the sides on their way to the stamping apparatus by adjustable stops 18 arranged on the table 3.

The stamping apparatus consists of a stationary lower stamp 19 and a movable upper stamp 20 with a known plate 20 and a sprin 20". The movable stamp 20 can slide in guides 21 in the frame A and is actuated in a known manner by means of a connecting rod 22. The blank is first guided so far over the lower stamp that it comes into contact with a straightening plate 23, which is arranged on the side of the upper stamp 20 remote from the receptacle 2. At right angles to this plate there is fitted to the upper stam a further straightening plate, against w ich the blank likewise bears, so that the correct position of the blank on the lower stamp is ensured.

If the blank has not immediately assumed the correct osition it is shifted during the descent of the upper stamp by conical abutment pins 24, w ich are provided on the upper stamp on the sides opposite to the straightening plates 23, in such a way as to make it bear against the straightening plates. The abutment ins 24, which are mounted on the side of t e upper stamp adjacent to the receptacle 2 are so arranged that dthe feeding of the blank is not hampere During the descent of the uppser stamp 20 the corners of the blank are t separated alon the lines shown dotted in Fig. 1'. At the our corners of the upper stam are arran ed knives 25, each two of whic form a rig t angle. The knives co-operate with counter-knives 26, which at the same time form the upper ms of passa es 27 of rectangular crosssection provide at the four corners of the lower stamp. The knives 26 can be adjusted and held fast as required by means of positioning screws 28 and clamping screws 29. The corners separated from the blank by the knives 25 and 26 are pushed down into the passages 27 by pegs 30, which are mounted on the upper stamp, and removed from the stam mg apparatus. This removal from the sai assages into which fall, may be efby rams dropping freely into the passages; or else ial grippers or the like may be employe whic seize the separated portions and conve them awa or an air suction ipe may connec to the passages and e discharging of the corners effected by the aid thereof. Finally, the flaps a, 6, a and d of the blank are bent over in a known manner, so that they bear against the sides of the lower stamp.

On the rear abutment plate 23 is arran Stlififel 31, the bent end of y on the lower stamp.

it hook-aha which alide s late A similar stripper is also fitted to the opposite side of the upper stamp, the carrier 32 of this stripper 32 being provided with a recess, through which the pieces of work can be carried. When the upper stamp has assumed its lowest position the hook-shaped ends are located below the bent-over flaps of the blank. As soon as the stamp 20 ascends, the strippers 31 and 32 engage the outer edges of the flaps of the blank and lift it off the lower stamp. \Vhen the upper stamp is in its highest position, the hooked ends 31, 32' are flush with the upper surface of the lower stamp. The work can now be removed out of reach of the stamps in a known manner by an ejector 34.

In order to guard against a fresh blank being fed to the stampin" apparatus when a finished blank has not been properly removed, a locking device is provided, which checks the movement of the pusher towards the stamping apparatus until room is made for a fresh blank.

A swing lever 35 is provided, which can rotate about a bolt 36 on the machine frame A, and which carries at its free end a stop surface 37. On the swing lever 35 is provided a cam finger 38, which engages with a locking pin 39. The locking in 39 engages in a notch in a locking bar 41, which places itself before an abutment 42 on the pusher 5, and locks the slide. The locking ar 41 is subject to the influence of a spring 43.

When a finished piece of work is delivered by the ejector 34 against the impact surface 37 of the swing lever 35, the lever 35 swings out. The cam finger 38 lifts the locking pm 39 out of the notch 40, so that the bar 41 can 'eld to the pull of the s rin 43 and is rought out of reach of tie a utment 42. The slide can now move forwards and deliver a fresh blank to the stamping apparatus. When the pusher 5 goes back, a second abutment 44 adjustably arranged on the pusher 5 comes into contact with one arm of a bell-crank lever 45 rotatably mounted on the machine frame. The free arm of the bell-crank lever is pivotally connected at 46 to the locking bar 41 and guides the bar 41 back into the locking position as soon as the bell-crank lever 45 is caused to swing out by the returning slide.

What I claim is:-

1. A box making machine, more )articularly for the manufacture of box 1i 5, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recms corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, hook-shaped strippers on said upper stamp, the hooked ends of which are adapted to slide underneath the feeding plane of the blanks on the side walls of the stamp, two straightening surfaces adapted to extend right into the feeding plane of the blanks when the upper stamp is raised, guides opposite to said straightening surfaces, said guides having oblique surfaces adapted to bring the blank pushed on to the.

lower stamp to bear accurately upon said straightening surfaces, four passages of rcetangular profile at the corners of the lower stamp, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the upper rims of said four passages at the corners of the lower stamp to separate the angular cutout portions from the blank, the hookshaped strippers being adapted to pull the work off the lower stamp during the ascent of the upper stamp after the stamping and drawing have been done, an ejector for the finished article, a movable stop against which said ejector delivers the finished article, means for feeding fresh blanks to the stamps, and locking means for locking said feeding means, the movable stop being adapted to release said locking means when the finished article is pushed against it by the ejector.

2. A box making machine, more particularly for the manufacture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, hook-shaped strippers on said upper stamp, the hooked 'ends of which are adapted to slide underneath the feeding plane of the blanks on the side walls of the stamp, two straightening surfaces adapted to extend right into the feeding plane of the blanks when the upper stamp is raised, guides opposite to said straightening surfaces, said guides having oblique surfaces adapted to bring the blank pushed on to the lower stamp to bear accurately upon said straightening surfaces, four passages of rectangular profile at the corners of the lower stamp, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the aipper rims of said four passages at the corners of the lower stamp to separate the angular cutout portions from the blank, the hookshaped strippers being adapted to pull the work off the lower stamp during the ascent of the upper stamp after the stamping and drawing have been done, an ejector for the finished article, a pusher adapted to feed one blank at a time from a pile of blanks to the stamping apparatus, and a locking device adapted to prevent said pusher from executing its pushing in movement before the blank previously introduced has been ejected as a finished box part, said locking means comprising a lug fitted to the pusher, a locking bar adapted to engage with said lug and prevent the pusher from moving, a spring tending to withdraw said locking bar from the pusher, a locking pin adapted to pre-- vent the locking bar from being withdrawn from the lug by said spring, a swing lever adapted when rocked to withdraw said locking pin from the locking bar, and an impact plate at the free end of said swing lever adapted to rock said lever upon receiving the impact of an ejected box part.

3. A box making machine, more particularly for the manufacture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side Walls of the lower stamp, an ejector for the finished article, a pusher adapted to feed one blank ata time from a pile of blanks to the stamping apparatus, and a locking device adapted to prevent said pusher from executing its pushing in movement before the blank previously introduced has been ejected as a finished box part, said locking means comprising a lug fitted to the pusher, a locking bar adapted to engage with said lug and prevent the pusher from moving, a spring tending to withdraw said locking bar from the pusher, a locking pin adapted to prevent the locking bar from being Withdrawn from the lug by said spring, a swing lever adapted when rocked to withdraw said locking pin from the locking bar, an impact plate at the free end of said swing lever adapted to rock said lever upon receiving the impact of an ejected box part, a tappet secured to the pusher, a bent lever adapted to be actuated by said tappet during the return stroke of the pusher, said bent lever being adapted to move the locking bar back into locking engagement with the lug against the action of the spring, and the locking pin being adapted at the same time to return into locking engagement with the locking bar.

4. A box making machine, more particularly for the manufacture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, hook-shaped strippers on said upper stamp, the hooked ends of which are adapted to slide underneath the feeding plane of the blanks on the side walls of the stamp, two straightening surfaces adapted to extend right into the feeding plane of the blanks when the upper stamp is raised, guides opposite to said straightening surfaces, said guides having oblique surfaces adapted to bring the blank pushed on to the lower stamp to bear accurately upon Ill) said straightening surfaces, four passages of rectangular profile at the corners of the lower stamp, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the upper rims of said four passages at the corners of the lower stalnp to separate the angular cut-out portions from the blank, the hook-shaped strippers being adapted to pull the work off the lower stamp during the ascent of the upper stamp after the stamping and drawing have been done, an ejector for the finished article. a pusher adapted to feed one blank at a time from a pile of blanks to the stamping apparatus, a locking device adapted to prevent said pusher from executing its pushing in movement before,

the blank previously introduced has been ejected as a finished box part, said locking means comprising a lug fitted to the pusher. a locking bar adapted to engage with said lug and prevent the pusher from moving, a spring tending to withdraw said locking bar from the pusher, a locking pin adapted to prevent the locking bar from being with drawn from the lug by said spring, a swing lever adapted when rocked to withdraw said locking pin from the locking bar, an impact plate at the free end of said swing lever adapted to rock said lever upon receiving the impact of an ejected box part, a tappet secured to the pusher, a bent lever adapted to be actuated by said tappet during the return stroke of the pusher, said bent lever being adapted to move the locking bar back into locking engagement with the lug against the action of the spring, and the locking pin being adapted at the same time to return li)nto locking engagement with the locking 5. A box making machine, more particularly for the manufacture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, a table adapted to support a pile of blanks, a casing surrounding said pile of blanks, a pusher adapted to feed one blank at a time from a pile of blanks to the stamping apparatus, said pusher comprising small knives projecting above the plane of the table a distance equal to the thickness of a blank. and means for pushing said knives against the pile so that, only the bottom blank is removed therefrom each time.

6. A box making machine, more particularly for the manufacture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, hook-shaped strippers on said upper stamp, the hooked ends of which are adapted to slide underneath the feeding plane of the blanks 0n the side walls of the stamp, two straightening surfaces adapted to extend right into the feeding plane of the blanks when the upper stamp is raised, guides opposite to said straightening surfaces, said guides having oblique surfaces adapted to bring the blank pushed on to the lower stamp to bear accurately upon said straightening surfaces, four passages of rectangular prolile at the corners of the lower stamp, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the upper rims of said four passages at the corners of the lower stamp to separate the angular cutout portions from the blank, the hookshaped strippers being adapted to pull the work off the lower stamp during the ascent, of the upper stamp after the stamping and drawing have been done, an ejector for the finished article. a movable stop against which said ejector delivers the finished article, means for feeding fresh blanks to the stamps, and locking means for locking said feeding means, the movable stop being adapted to release said locking means when the finished article is pushed against it by the ejector, said means for feeding a fresh blank to the stamps comprising a table adapted to support a pile of blanks. a casing surrounding said pile of blanks. small knives projecting above the plane of the table a distance equal to the thickness of a blank. and means-for pushing said knives against the. pile so that only the bottom blank is removed therefrom each time.

7. A box making machine, more particularly for the manufacture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, a table adapted to supporta pile of blanks, a casing surrounding said pile of blanks, a vertically adjustable slideforming the lower part of the wall of said casing on the side facing the stamping apparatus to enable a gap to be left at the bottom of said wall of such vertical breadth that only one blank can leave the pile at a time, small knives projecting above the plane of the table a distance equal to the thickness of a blank, and means for pushing said knives against the pile so that only the bottom blank is removed therefrom each time.

8. A box making machine, more particularly for the manufacture of box lids. comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, hook-shaped strip ers on said upper stamp, the hooked ends 0 which "are adapted to slide underneath the feeding plane of the blanks on the side walls of the stamp, two straightening surfaces adapted to extend right into the feeding plane of the blanks w en the upper stamp is raised, guides opposite to said straightening sur aces, said guides having oblique surfaces adapted to bring the blank pushed on to the lower stampto bear accurately upon said straightening surfaces, four passages of rectangular profile at the corners of the lower stamp, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the upper rims of said four passages at the corners of the lower stamp to separate the angular cutout portions from the blank, the hookshaped strippers being adapted to pull the work off the lower stamp during the ascent of the upper stamp after the stamping and drawing have been done, an ejector for the finished article, a movable stop against which said ejector delivers the finished article, means for feeding fresh blanks to the stamps, locking means for locking said feeding means, the movable stop being adapted to release said locking means when the finished article is pushed against it by the ejector, said means for feeding a fresh blank to the. stamps comprising a table adapted to support a pile of blanks, a casing surrounding said pile of blanks, a vertically adjustable slide forming the lower part of the wall of said casing on the side facing the stamping apparatus to enable a gap to be left at the bottom of said wall of such vertical breadth that only one blank can leave the pile at a time, small knives projecting above the plane of the table a distance equal to the thickness of a blank, and means for ushing said knives against the pile so that only the bottom blank is removed therefrom each time.

9. A box making machine, more articularly for the manufacture of box li s, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, a hook-shaped stripper on the blank feeding side of the upper stamp, a

,hook carrier carrying said stripper, said hook carrier being formed with a gap through which the blanks can pass to the stamping apparatus, and 'a second hookshaped stripper on the opposite side of the upper stamp, the free extremities of said hook-shaped strippers being adapted to slideon the side walls of the lower stamp and" pull the work off it when the upper stamp ascends and to be flush with the surface of the lower stamp when the upper stamp is in its highest position.

10. A box making machine, more articularly for the manufacture of box li s, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps ofthe blank over the side walls of the lower stamp, a hook-shaped stripper on the blank feeding side of the upper stamp, a hook carrier carrying said stripper, said hook carrier being formed with a gap through which the blanks can pass to the stamping apparatus, a second hook-shaped stripper on the opposite side of the upper stamp, the free extremities of said hookshaped strippers being adapted to slide on the side walls of the lower stamp and pull the work off it when the upper stamp ascends and to be flush with the surface-of the lower stamp when the upper stamp is in'its highest position, two straightening surfaces adapted to extend right into the article, a movable stop against which said ejector delivers the finished article, means for feeding fresh blanks to the stamps, and locking means for locking said feeding means, the movable stop being adapted to release said locking means when the finished article is pushed against it by the ejector.

11. A boxmaking machine,'more particularly for the manufacture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, means for feeding fresh blanks to the stamps, a hook-shaped stripper on the blank feeding side of the upper stamp, a hook carrier carrying said stripper, said hook carrier being formed with a gap through which the blanks can pass to the stamping apparatus, a" second hookshaped stripper on the opposite sideof the upper stamp, a second hook carrier carrying said second hook-shaped stripper, said second hook carrier being constructed as a straightening plate, a second straightening plate on an ad'acent side of the upper stamp, and downwardly projecting pins on the two sides of the upper stamp not occupied by straightening plates, said pins being adapted to cause a blank introduced into the stamping apparatus to bear accurately against the straightening plates.

12. A box making machine, more particularly for the manufacture of box lids comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, means for feedin fresh blanks to the stamps, a hook-shaped stripper on the blank feeding side of the upper stamp, a hook carrier carrying said stripper, said hook carrier being formed with a gap through which the blanks can pass to the stamping apparatus, a second hook-shaped stripper on the opposite side of the upper stamp, a second hook carrier carrying said second hook-shaped stripper, said second hook carrier being constructed as a straightening plate, a second straightening plate on an adjacent side of the upper stamp, downwardly projecting pins on the two sides of the upper stamp not occupied by straightening plates, said pins being adapted to cause a blank introduced into the stamping apparatus to bear accurately against the straightening plates, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the upper rims of said four passages at the corners of the lower stamp to separate the angular cut-out portions from the blank, the hook-shaped strippers being adapted to pull the work off the lower stamp during the ascent of the upper stamp after the stamping and drawing have been done, an ejector for the finished article, a movable stop against which said ejector delivers the finished article, and locking means for locking said feeding means, the movable stop being adapted to release said locking means when the finished article is pushed against it by the ejector.

' 13. A box making machine, more particularly for the manufacture of box lids comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side flaps of the blank over the side walls of the lower stamp, four passages of rectangular profile at the corners of the lower stamp, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the upper rims of said four passages at the corners of the lower stamp to separate the angular cut-out portions from the blank, pins on the upper stamp within range of said knives, adapted to push the cut off corners of the blank into the passages at the corners of the lower stamp.

14. A box makin r machine, more particularly for the manu facture of box lids, comprising a rectangular lower stamp adapted to receive a box blank, an upper stamp formed with a recess corresponding to the lower stamp and adapted to bend the side 'flaps of the blank over the side walls of the lower stamp, hook-Shaped strippers on said upper stamp, the hooked ends of which are adapted to slide underneath the feeding plane of the blanks on the side walls of the stamp, two straightening surfaces adapted to extend right into the feeding lane of the blanks when the upper stamp is raised, guides opposite to said straightening surfaces, said guides having oblique surfaces adapted to bring the blank pushed on to the lower stamp to bear accurately upon said straightening surfaces, four passages of rec tangular profile at the corners of the lower stamp, approximately right-angled separating knives at the four corners of the upper stamp adapted to co-operate with the upper rims of said four passages at the corners of the lower stamp to separate the angular cutout portions from the blank, pins on the upper stamp within range of said knives, adapted to push the cut off corners of the blank into the passages at the corners of the lower stamp, the hook-shaped strippers being adapted to pull the work off the lower stamp during the ascent of the upper stamp after the stampin and drawing have been done, an ejector or the finished article, a movable stop against which said ejector dclivers the finished article, means for feeding fresh blanks to the stamps, and locking means for locking said feeding means, the movable stop being adapted to release said locking means'when the finished article is pushed against it by the ejector.

In testimony whereof I have signed my name to this specification.

ALBERT UHLIG. 

